A human rights group has accused some police of not wearing ID badges during the APEC rally in Sydney yesterday.

Dale Mills from the volunteer organisation Human Rights Monitors says there is evidence that about 200 officers removed their badges so they could not be identified for complaints of assault.

He says monitors took photos of the police concerned, and he is threatening to post them on the internet unless they are disciplined for breaching police protocol.

"This might seem like a trivial matter, but what it means is that when allegations of assault and improper behaviour are made against individual police officers it's very difficult to identify them, precisely because they're not wearing the badges," he said.

New South Wales Police Commissioner Andrew Scipione said police would investigate the claims if evidence was made available.

"There is a requirement that police do wear that type of identification and no order was given to the contrary today that I would think of," he said.

"If you've got evidence that we need to look at or information, I'm certain that our professional standards command will be happy to take that.

"You can be certain that we'd be following it up on the basis that we follow every one of those matters up."

In another development, two of the people on the New South Wales Government's APEC security blacklist say they were arrested while sitting peacefully in Hyde Park after yesterday's rally.

Paddy Gibson and Daniel Jones went to court last week to try to get their names off a list of dozens of people excluded from certain APEC areas.

Mr Gibson says they were released without charge once police realised they were not in an excluded zone, but claims the arrests provoked other people.

"I started moving away from the area and was pretty quickly thrown to the floor by police and had a knee put into my head and pushed into the concrete and put in handcuffs and sort of dragged away along the ground from the scene," he said.

"A number of other people [who] were quite distressed about the whole thing, coming to my aid were also arrested by police."